4. PROPERTY AND EQUIPMENT (Tables)

6 Months Ended

Oct. 31, 2015

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

	October 31, 2015			April 30, 2015
Leasehold improvements	$	1,657,000		$	1,538,000
Laboratory equipment		6,171,000			5,965,000
Furniture, fixtures, office equipment and software		4,023,000			3,991,000
Construction-in-progress		18,559,000			11,819,000
		30,410,000			23,313,000
Less accumulated depreciation and amortization		(8,646,000	)		(8,189,000	)
Property and equipment, net	$	21,764,000		$	15,124,000